-LRB- CNN -RRB- -- Country music artist John Rich had such a great time in Las Vegas that he was not fit to fly home to Nashville on Sunday , according to Southwest Airlines .

Rich , 37 , was escorted off a Southwest flight before it took off from Las Vegas Sunday night , airline spokeswoman Christi McNeill said Monday .

`` Our crew assessed the situation and determined that the passenger was not fit for travel , '' McNeill said .

It was not clear what led to Rich 's getting booted from the plane , but the singer 's spokeswoman Tree Paine denied online reports that he was involved in a fight with another passenger .

`` Did John Rich have a great time with his fans in Vegas ? Yes . Was there an altercation ? Absolutely not , '' a statement said .

Southwest gave Rich -- of the band Big & Rich -- and a fellow traveler a refund and they found alternative travel arrangements to Nashville , the airline spokeswoman said .

`` Our employees are responsible for the safety and comfort of everyone on board a flight , '' McNeill said . `` If we can mitigate an uncomfortable situation prior to departure , it is our preference to do so , and that is what happened in this scenario . ''

CNN 's Denise Quan contributed to this report .

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John Rich is escorted off Southwest flight at Las Vegas airport

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Crew says Big & Rich singer `` was not fit for travel , '' airline spokeswoman says

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Singer 's spokeswoman : `` Did John Rich have a great time with his fans in Vegas ? Yes . ''

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Rich spokeswoman denies there was a fight with another passenger